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Perovskite quantum dots (PQDs) are the preferred luminescent materials for constructing color\u2010conversion micro\u2010LED pixels, but their poor environmental stability severely limits their practical application in micro\u2010LED displays. Here, we design a novel submicron\u2010sized PQD glass microspheres (PQDGMS) with high quantum yield and excellent stability for color conversion micro\u2010LED displays. Kilogram scale (batch 2\u00a0kg) submicron\u2010sized PQDGMS was prepared by a top\u2010down strategy including melt\u2010quenching, secondary recrystallization, and optimized submicronization processes. Ultra\u2010stability of the PQDGMS was attributed to the passivation and self\u2010healing effects of PQDs by AgBr additive, and the protection effect of the glass matrix around PQDs. The prepared PQDGMS has excellent environmental stability, with PL intensity maintained over 95% after immersion in water for 10\u00a0000 h, over 82% at a temperature of 100\u00b0C, and over 86% under continuous blue light irradiation (800\u00a0W m\n                    <jats:sup>\u22122<\/jats:sup>\n                    ) for 240 h. We prepared the PQDGMS color conversion pixels in a patterned through\u2010hole glass substrate via capillary filling assistance and constructed color conversion green and red micro\u2010LED chips with external quantum efficiency of 24.8% and 16.7%, respectively.\n                  <\/jats:p>","DOI":"10.1002\/adma.73397","type":"journal-article","created":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T08:02:43Z","timestamp":1778832163000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Submicron Perovskite Quantum Dot Glass Microspheres for Micro\u2010LED Displays"],"prefix":"10.1002","volume":"38","author":[{"given":"Ye","family":"He","sequence":"first","affiliation":[{"name":"College of Chemistry and Materials Engineering Wenzhou University  Wenzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiapeng","family":"Yang","sequence":"additional","affiliation":[{"name":"College of 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